氧化还原
氧气
化学
离子
格子(音乐)
无机化学
结晶学
分析化学(期刊)
声学
色谱法
物理
有机化学
作者
Kehua Dai,Jinpeng Wu,Zengqing Zhuo,Qinghao Li,Shawn Sallis,Jing Mao,Guo Ai,Chihang Sun,Zaiyuan Li,William E. Gent,William C. Chueh,Yi‐De Chuang,Rong Zeng,Zhi‐Xun Shen,Feng Pan,Shishen Yan,Louis F. J. Piper,Z. Hussain,Gao Liu,Wanli Yang
出处
期刊:Joule
[Elsevier]
日期:2019-02-01
卷期号:3 (2): 518-541
被引量:252
标识
DOI:10.1016/j.joule.2018.11.014
摘要
Summary
The reversibility and cyclability of anionic redox in battery electrodes hold the key to its practical employments. Here, through mapping of resonant inelastic X-ray scattering (mRIXS), we have independently quantified the evolving redox states of both cations and anions in Na2/3Mg1/3Mn2/3O2. The bulk Mn redox emerges from initial discharge and is quantified by inverse partial fluorescence yield (iPFY) from Mn-L mRIXS. Bulk and surface Mn activities likely lead to the voltage fade. O-K super-partial fluorescence yield (sPFY) analysis of mRIXS shows 79% lattice oxygen redox reversibility during the initial cycle, with 87% capacity sustained after 100 cycles. In Li1.17Ni0.21Co0.08Mn0.54O2, lattice oxygen redox is 76% initial-cycle reversible but with only 44% capacity retention after 500 cycles. These results unambiguously show the high reversibility of lattice oxygen redox in both Li-ion and Na-ion systems. The contrast between Na2/3Mg1/3Mn2/3O2 and Li1.17Ni0.21Co0.08Mn0.54O2 systems suggests the importance of distinguishing lattice oxygen redox from other oxygen activities for clarifying its intrinsic properties.
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